If you’ve been paying attention to Apple’s naming conventions for its products and apps, you may have noticed that it’s shifted into a more uniform naming style lately.

All of the operating systems in Apple’s ecosystem follow a highly pattern in their branding – iOS for mobile phones, tvOS for Apple TV devices and watchOS for wearables. Only the operating system for Mac computers – OS X – not – doesn’t adhere to this naming convention, but that looks like it’s about to change – to MacOS.

Whether intentional or not, Apple dropped a hint about the change. Discussing the lifespan of products on its new environmental webpage in honour of Earth Day 2016, the operating system gets a mention by the new name.

“Years of use, which are based on first owners, are assumed to be four years for MacOS and tvOS devices and three years for iOS and watchOS devices,” it wrote.

This isn’t the first time that it has happened as The Verge notes that last month, an OS X framework file contained the name ‘macOS’.

It does make one wonder when it could possibly change the name of the iPhone to something more uniform, if it is moving in that direction – to something like Apple Phone. It would make sense, as less products have the iconic ‘i’ in front of the name.

In any case, don’t hold your breath for an official announcement until Apple’s WWDC developers conference in June.

Out of interest, we have had MacOS before – first introduced in 1984 for the original Macintosh, and was in use until 2000.